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calculeaza rapid,folosin proprietatea de asociativitate a adunarii dupa model
Exemplu: 72+28=
=70+2+28=
=70+(2+28)=
=70+30=
=100
De calculat:
a)334+66=
b)127+273=
c)993+2.107=
d)4.675+1.325=
e)35.275+24.725=